Io Transit of Jupiter

While hunting for volcanic plumes on Io, the NASA/ESA Hubble Space Telescope captured this image of the volatile moon sweeping across the giant face of Jupiter.

While hunting for volcanic plumes on Io, the NASA/ESA Hubble Space Telescope captured these images of the volatile moon sweeping across the giant face of Jupiter. Only a few weeks before these dramatic images were taken, the orbiting telescope snapped a portrait of one of Io's volcanoes spewing sulfur dioxide 'snow.'